class Container {
	static of(value) {
		return new Container(value)
	}
	constructor(value) {
		this._value = value
	}

	map(func) {
		return Container.of(func(this._value))
	}
}

class Maybe {
	static of(value) {
		return new Maybe(value)
	}

	constructor(value) {
		this._value = value
	}

	map(fn) {
		return this._isNotEmpty()
			? Maybe.of(this._value)
			: Maybe.of(fn(this._value))
	}

	_isNotEmpty() {
		return this._value === undefined || this._value === null
	}
}

module.exports = {
	Container,
	Maybe,
}
